diff --git a/doc/Makefile b/doc/Makefile
index 011d66d1454..e94b4c38072 100644
--- a/doc/Makefile
+++ b/doc/Makefile
@@ -38,7 +38,7 @@ man-html:
 	echo '</head><body>' >>$@/index.html
 	echo '<h1>Opam $(version) man-pages index</h1>' >>$@/index.html
 	echo '<ul>' >>$@/index.html
-	for f in ${MANDIR}/*; do\
+	for f in ${MANDIR}/*.1; do\
 	  man2html -r $$f | sed 1,2d > $@/$$(basename $$f .1).html;\
 	  echo "  <li><a href=\"$$(basename $$f .1).html\">$$(basename $$f .1)</a></li>" >>$@/index.html;\
 	done
